Throttle handle



Sept. 29, 1931. E. w. STEVENS 1,825,290

THROTTLE HA-NDLE Filed Sept. 27, 1928 INVENTOR. fawara [1/ Sfe ens ATTORNEY.

Patented- Sept. 29, 1931 I UNITED STATES PIATENT OF F ICE' EDWARD W. STEVENS, OI DETROIT, MICHIGAN, ASSIGNOB TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y A CORPORATION OF NEW'JERSEY THROTTLE HANDLE This invention relates to apparatus for controlling the operation of fluid pressure tools and machines. More specifically it concerns throttle control valves, especially when associated with handles for manually supporting or directing the tools or machines.

One object of the invention is to provide an improved throttle arrangement which will control both the fluid inlet and the exhaust of a tool or machine. Another object is to effect such control by the use of but a single control member and without loss of motive fluid. Another object is to provide a simple and inexpensive manual support and throttle device which will efiect such objects. Other objects will be apparent from the detailed description which follows.

In order to illustrate the invention, one

concrete embodiment thereof is shown in the a0 accompanying drawings in which:

Fig. 1 is a sectional view of the throttle handle as applied to a fluid pressure tool which is shown largely broken away but partly in section; I I Fig. 2 is a view of the throttle handle alone, showing certain of the parts'in a dlfi'erent position; and

Figs. 3 and tare respectively, a side elevational viewand a bottom plan view of the valve plunger.

The embodiment of the invention, chosen for the purpose of illustration, comprises a throttle handle device indicated generally at A and shown as applied to a fluid pressure tool or machine B of any suitable or desired type. In the present instance, the tool B is a squeeze riveter having a piston 12 adapted to be moved in one direction by pressure fluid admitted thereto through a passage b and restored to the position shown on venting of the pressure fluid through the action of a sprin b.

The throttle handle device A, to which the invention directly relates, has a grip portion 5 having a chamber 6 therewithin adapted to be connected to a source of motive fluid and a second chamber 7 for connection with the inlet passage b of fluid pressuretool B, the cham ers being separated by a partition 8 having a port 8a therethrough for establish- :erating end 11d is arranged to be engaged by to provide a vent for chamber 7, the vent ing communication therebetween. Device A has a bore or port 9 through the exterior thereof in line with partition port 8a and a bushing 10 having a difierential bore is seated in ports 8a and 9 and traverses a portion of chamber 7 with one or more openings 10a in communication with the latter- A single valve member 11 is slidably mounted in bushing 10 to control the port opening between chambers 6 and 7, the mem her being in the form of a plunger having a head 11a disposed in chamber 6 to engage the inner end of bushing 10, a large diameter part 11?) adjacent the head and fitting the large diameter part of the bushing bore, and a smaller diameter part 110 of much greater length fitting the small diameter part of the bushing bore with an operating end. 1112 extending above and beyond the bushing. Op-

a manual operating lever 12 having a pivotal mounting on a pin 13 supported in ears 14 on throttle handle A. Valve 11 is yieldingly maintained with its head 11a in engagement with the lower end of the bushing by a coil spring 15 backed by a plug 16 in threaded engagement with an opening in handle device A beneath the partition bore 8a. I

Bushing 10 and valve plunger 11 cooperate preferably taking the form of an axial bore 116 in plunger 11 which has axially spaced transverse ports 11 and ilg communicating therewith, the former being adjacent the large diameter part 11?) of the plunger and the latter in the projecting operating end 11d. The axial bore in plunger 11 may be made from either end. In the event that it is made from the lower end, as shown in the drawings, the bore is closed by a suitable plug 17 (Figs. 1 and 2) preferably extending beyond head 11a so as to serve as a guide for spring 15.

In order to eliminate all waste ofpressure fluid, the venting of chamber 7 and the admitting of pressure fluid thereto from chamber 7 are not concurrent but sequential, the arrangement being such that the communicating port between chamber 6 and 7 controlled by valve plunger 11 cannot be opened while 100 the vent for chamber 7 is open. Conversely valve member seals said partition port so long the vent cannot be opened so long as pressure fluid is being admitted to chamber 7 from chamber 6. This control is effected by a critical determination of the extent of large diameter part 11?) on plunger 11 and the positioning of ports 119 to insure that the large diameter part 11?) continues to seal the port between chamber 6 and 7 until after the vent ports 11;; are closed by the upper end of bushing 10. Fig. 1 shows the valve plunger in the closed position, the chamber 7 being vented through bushing opening 10a, ports 11f, axial bore 116, and ports 119 which are in communication with atmosphere. Fig. 2 shows the position of the parts when lever 12 has been moved downwardly to such an extent that vent ports 119 are closed by the upper end of bushing 10 and showing the large diameter portion 11b of valve plunger 11 still sealing the port between chambers 6 and 7 but about to open the same on further movement of the operating lever 12.

While the invention has been herein disclosed in what is now considered to be its preferred form, it is to be understood that the invention is not limited to the specific details thereof but covers all changes, modifications, and adaptations within the scope of the appended claims.

I claim as my invention 1. A throttle device for a fluid pressure machine having a chamber to be connected to said machine and another chamber to be connected to a source of fluid pressure. a partition separating said chambers and having a port therethrough, and a movable valve member controlling said port, said member extending beyond said device and providing a vent in its extended portion for said machine chamber but arranged to seal said port so long as said vent is open.

2. A throttle handle for a fluid pressure tool providing two chambers, a partition separating said chambers and having a port therethrough, said handle having a port in the exterior thereof in line with said partition port, a single valve member slidably arranged in said ports'to control the connection between said chambers. said member providing a vent for one of said chambers and having means maintaining a seal at said partition port so long as said vent is open.

3. A throttle handle for a fluid pressure tool providing two chambers. a partition separating said chambers and having a port therethrough. said handle'having a port in the exterior thereof in line with said partition port, a bushing seated in said ports and traversing one of said chambers, a single valve member slidably mounted in said bushing for controlling said partition port, and means providing a vent for said bushing traversed chamber under control of said valve, said parts being so arranged that said as said vent is open.

4. A throttle handle for a fluid pressure tool providing two chambers, a partition separating said chambers and having a port therethrough, said handle having a port in the exterior thereof in line with said partition port, a bushing seated in said ports and traversing one of said chambers, said bushing having a two diameter bore and an opening into said last named chamber, a valve member slidably mounted Within said bushing for controlling said partition port and having an axial bore providing a vent for said last named chamber, said valve member being constructed and arranged so that said vent is open only when said partition port is sealed.

5. A throttle handle for a fluid pressure tool providing two chambers, a partition separating said chambers and having a port therethrough, said handle having a port in the exterior thereof in line with said partition port, a bushing seated in said ports and traversing one of said chambers, said bushing having a two diameter bore and an opening into said last named chamber, a two diameter valve member slidably mounted in said bushing for controlling said partition port, means providing a vent for said last named chamber including an axial bore in the small diameter portion of said valve member, and means for closing said vent when and before said valve member is moved to a position to open said partition port.

6. A throttle handle for a fluid pressure tool providing two chambers, a partition separating said chambers and having a port therethrough, said handle having a port in the exterior thereof in line with said partition port, a bushing seated in said ports and traversing one of said chambers, said bushing having a two diameter bore and an opening into said last named chamber, a two diameter valve member slidably mounted in said bushing for controlling said partition port and having an operating end extending above said bushing, said valve member having an axial bore in the small diameter portion thereof with transverse ports in the plane of said bushing opening and in its exposed end to provide a vent for said last named chamber, the large diameter portion of said valve being of suflicient length to maintain a seal at said partition port until the vent port in the exposed end of said valve member is sealed by aid bushing.

7. A throttle handle for a fluid pressure tool providing two chambers, a partition separating said chambers and having a port therethrough, said handle having a port in the exterior thereof in line with said partition port, a bushing seated in said ports and traversing one of said chambers, said bushing having a two diameter bore and an opening into said last named chamber, a two diameter valve member slidably mounted in said bushing and having a head to engage the inner end of the bushing and an operating end extending above the outer end of the bushing, means for yieldingly maintaining said head against said bushing, a lever mounted on said handle and engaging said operatingend to move said valve member against said yielding means, said valve member having anaxial bore in the small diameter portion thereof with transverse ports in the plane of said bushing opening and in its exposed end to provide a vent for saidlast named chamber, the large diameter portion of said valve being of suiiicient length to maintain a seal at said partition port until the vent port in the exposed end of said valve member is sealed by said bushing.

8. A combined throttle valve and ventmember comprising an elongated plunger having dlflerentlal concentric portlons, the large diameter portlon bein at one end and of relatively small length, the smaller diamand a differential extension thereon provid- 'ing a large diameter part immediately adja cent said he ad and a smaller diameter part of greater length therebeyond, an axial bore in said smaller diameter part and axially spaced transverse ports communicating with said bore.

Signed by me at Detroit, in the county of Wayne, and State'of Michigan, this 25th day of September, 1928.

EDWARD W. STEVENS. 

